added missing javadoc

Author: broken1arrow

Commands/src/main/java/org/broken/arrow/library/command/commandhandler/MainCommandHandler.java

@@ -172,6 +172,11 @@ private boolean addCommands(CommandProperty subCommand, Set<String> commandLabel
         }
     }
 
+    /**
+     * Retrieve the subcommands set if you not using the main command.
+     *
+     * @return The list of sub commands or empty list if non is set.
+     */
     public  List<CommandProperty> getSubcommands() {
         return this.commands;
     }